CN215406364U

CN215406364U - Toilet overflow device, toilet tank and toilet

Info

Publication number: CN215406364U
Application number: CN202120841620.3U
Authority: CN
Inventors: 毕大岩; 谢伟藩; 王玉涛; 彭志遒
Original assignee: Hegii Sanitary Ware Group Co Ltd
Current assignee: Hegii Sanitary Ware Group Co Ltd
Priority date: 2021-04-22
Filing date: 2021-04-22
Publication date: 2022-01-04
Anticipated expiration: 2031-04-22

Abstract

The utility model provides a toilet overflow device, a toilet water tank and a toilet, wherein the toilet overflow device is hermetically connected to an overflow pipe in the toilet water tank and comprises: a sealing part which can seal the first opening end of the overflow pipe; a pressure relief portion in sealing engagement with the sealing portion, the pressure relief portion configured to disengage from the sealing portion under a buoyancy of a first liquid within the toilet tank to allow outside air to enter the overflow tube; and under the action of the second liquid buoyancy in the toilet water tank, the sealing part is linked to be separated from the first opening end. The toilet overflow device, the toilet water tank and the toilet can solve the problem of liquid leakage in the toilet water tank, and have compact structure and smaller opening force required for opening the overflow pipe.

Description

Toilet overflow device, toilet tank and toilet

Technical Field

The utility model relates to the technical field of overflow water seals, in particular to a toilet overflow device, a toilet water tank and a toilet.

Background

The squatting pan that connecting pipe was deposited water in advance has appeared on the market at present, realizes mainly that connecting pipe and outside air keep apart through sealed overflow mouth to and be equipped with a water seal and realize the deposit water in advance of connecting pipe in connecting squatting pan department, this connecting pipe is deposited water in advance and has reduced water loss to a certain extent, has strengthened the washing away performance, has also brought the overflow problem thereupon.

The existing problems are as follows: in order to overcome the opening pressure caused by the negative pressure in the connecting pipe, a larger buoy is needed to open the connecting pipe, and the squatting pan water tank is limited in space and difficult to install the larger buoy.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a toilet overflow device, a toilet water tank and a toilet, which can solve the problem of liquid leakage in the toilet water tank, have compact structure and small opening force required for opening an overflow pipe.

The present invention can be implemented by the following technical means.

The utility model provides a toilet overflow device, which is hermetically connected to an overflow pipe positioned in a toilet water tank, and comprises:

a sealing part which can seal the first opening end of the overflow pipe;

a pressure relief portion in sealing engagement with the sealing portion, the pressure relief portion configured to disengage from the sealing portion under a buoyancy of a first liquid within the toilet tank to allow outside air to enter the overflow tube; and under the action of the second liquid buoyancy in the toilet water tank, the sealing part is linked to be separated from the first opening end.

In an embodiment of the present invention, the sealing portion is provided with at least one pressure relief hole, and the pressure relief portion is provided with at least one blocking pillar, and the blocking pillar is in sealing fit with the pressure relief hole.

In an embodiment of the utility model, at least one of said pressure relief holes has a cross-sectional area smaller than a cross-sectional area of said first open end.

In an embodiment of the present invention, a sealing gasket is disposed on an end surface of the pressure relief portion, which is engaged with the sealing portion, and the sealing gasket is disposed around an outer periphery of at least one of the blocking posts.

In an embodiment of the present invention, at least one interlocking structure is disposed between the pressure relief portion and the sealing portion, and the interlocking structure is configured to enable the pressure relief portion to drive the sealing portion to be separated from the first opening end under the action of the second liquid buoyancy.

In an embodiment of the present invention, the interlocking structure includes a guiding post disposed on the sealing portion, and a guiding hole disposed on the pressure relief portion, the guiding post is inserted into the guiding hole, a limiting member is disposed at a top end of the guiding post, which penetrates through the guiding hole, and a diameter of the limiting member is larger than an outer diameter of the guiding hole.

In an embodiment of the present invention, the toilet overflow device further includes a float, and the float is sleeved on the overflow pipe and connected to the pressure relief portion.

In an embodiment of the utility model, a guide structure is arranged between the buoy and the overflow pipe, and the guide structure comprises at least one guide rib and at least one guide groove, and the guide rib can be inserted into the guide groove.

In an embodiment of the utility model, at least one guide rib is arranged on the outer peripheral wall of the overflow pipe, and at least one guide groove is arranged on the inner peripheral wall of the buoy; or at least one guide rib is arranged on the inner peripheral wall of the buoy, and at least one guide groove is arranged on the outer peripheral wall of the overflow pipe.

In an embodiment of the present invention, the float includes a sleeve body and a floating body connected to the sleeve body, and the sleeve body is sleeved outside the overflow pipe and can be connected to the relief portion.

In an embodiment of the present invention, the overflow pipe has an inner diameter of 28mm to 32 mm.

In an embodiment of the present invention, the diameter of the pressure relief hole is 5mm to 10 mm.

In an embodiment of the utility model, the opening height of the sealing portion is greater than or equal to 18 mm.

The utility model also provides a toilet water tank which comprises the toilet overflow device.

The utility model also provides a toilet bowl, which comprises the toilet bowl water tank.

The utility model has the characteristics and advantages that:

the toilet overflow device provided by the utility model realizes pressure relief of the overflow pipe firstly by arranging the pressure relief part, so that the smooth opening of the sealing part is ensured, and the sealing part can be separated from the first opening end of the overflow pipe under the action of relatively small opening force. According to the utility model, firstly, under the action of the first liquid buoyancy, the overflow pipe is communicated with the external environment so as to smoothly discharge the negative pressure in the overflow pipe, so that the sealing part can be smoothly opened under the action of the second liquid buoyancy, and the second liquid buoyancy is smaller than the liquid buoyancy of the prior art, wherein the sealing cover is only arranged at the first opening end of the overflow pipe and is used for opening the sealing cover. The utility model has smaller opening force and is easier to realize miniaturization in structure.

The toilet water tank and the toilet provided by the utility model can effectively avoid the problem that liquid in the toilet water tank leaks, namely, the problem that the liquid in the toilet water tank is accumulated and cannot be smoothly discharged due to the damage of the water inlet valve is avoided, and the effect of increasing the flushing force of the toilet can be realized through the drainage of the overflow pipe.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural view of a toilet overflow device according to the present invention in a state of closing an overflow pipe.

Fig. 2 is a schematic structural view of the toilet overflow device of the present invention in a pressure relief state.

Fig. 3 is a schematic structural view of the toilet overflow device of the present invention in an open state.

Fig. 4 is a cross-sectional view of the toilet overflow device of the present invention.

Fig. 5 is a schematic structural view of the toilet overflow device according to the present invention, in which the sealing portion and the pressure relief portion are separated from each other.

Fig. 6 is a schematic view of the toilet tank of the present invention with the toilet overflow device in a closed overflow condition.

FIG. 7 is a schematic view of a toilet tank overflow tube in a pressure relief state according to the present invention.

Fig. 8 is a schematic view showing the overflow pipe of the toilet tank of the present invention in an overflowing state.

Fig. 9 is a schematic view of the structure of the toilet of the present invention.

Reference numerals and description:

1. a toilet tank; 11. an inner cavity; 12. a drain valve; 121. a water outlet; 13. a water outlet end; 2. an overflow pipe; 21. a first open end; 22. a second open end; 23. a guide rib; 3. a sealing part; 31. a first gasket; 32. a pressure relief vent; 33. a convex portion; 4. a pressure relief portion; 41. plugging the column; 42. a second gasket; 5. a linkage structure; 51. a guide post; 52. a guide hole; 53. a limiting member; 6. a float bowl; 61. a sleeve body; 62. a float; 63. a guide groove; 621. a hollow annular cavity; 7. a toilet body; 71. water seal bent pipe; 72. a connecting pipe; 8. a guide structure; 10. a toilet overflow device.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, in the description of the present invention, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is considered as indicating or implying relative importance. In addition, in the description of the present invention, "at least one" means one or more than one, and "a plurality" means two or more than two, unless otherwise specified. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.

Implementation mode one

The utility model provides a toilet overflow device, which is hermetically connected to an overflow pipe 2 in a toilet water tank 1 and comprises a sealing part 3 and a pressure relief part 4, wherein: the sealing part 3 can be arranged at the first opening end 21 of the overflow pipe 2 in a sealing way; a pressure relief portion 4 is in sealing fit with the sealing portion 3, and the pressure relief portion 4 is configured to be separated from the sealing portion 3 under the action of the first liquid buoyancy in the toilet tank 1, so that external air enters the overflow pipe 2; and the sealing part 3 is moved away from the first opening end 21 by the second liquid buoyancy in the toilet tank 1.

The toilet overflow device of the utility model realizes the pressure relief of the overflow pipe 2 firstly by arranging the pressure relief part 4, thereby providing guarantee for the smooth opening of the sealing part 3 and ensuring that the sealing part 3 can be separated from the first opening end 21 of the overflow pipe 2 under the action of relatively small opening force. According to the utility model, firstly, under the action of the first liquid buoyancy, the overflow pipe 2 is communicated with the external air environment, so that the negative pressure in the overflow pipe 2 can be smoothly released, and therefore, the sealing part 3 can be smoothly opened under the action of the second liquid buoyancy, wherein the second liquid buoyancy is larger than the first liquid buoyancy, and the second liquid buoyancy is smaller than the liquid buoyancy for opening the sealing cover by only arranging the sealing cover at the first opening end 21 of the overflow pipe 2 in the prior art. The utility model has smaller opening force and is easier to realize miniaturization in structure.

It is noted here that: the magnitude of force F1 for opening vent 4 may be the same as or different from the magnitude of force F2 for opening seal 3, and those skilled in the art can calculate or design the force F1 and force F2 according to the specific structure of vent 4 and seal 3, and the like, and the magnitudes of forces F3526 and F2 are not limited herein.

Specifically, the overflow pipe 2 is substantially in the shape of a straight pipe, and has a first open end 21 and a second open end 22, please refer to fig. 6 to 8, wherein the first open end 21 of the overflow pipe 2 is used for connecting with the toilet overflow device 10 of the present invention, and the second open end 22 of the overflow pipe 2 is connected with the water outlet 121 of the drain valve 12 disposed in the toilet tank 1 and is commonly connected with the water outlet 13 of the toilet tank 1.

As shown in fig. 1 to 5, the sealing portion 3 of the toilet bowl overflow device is substantially flat and can be attached to the first open end 21 of the overflow pipe 2 in a sealing manner, and a first gasket 31 is provided between the sealing portion 3 and the first open end 21 of the overflow pipe 2 to improve the sealing performance of the sealing portion 3 with respect to the first open end 21 of the overflow pipe 2. In this embodiment, the sealing portion 3 is formed with a protrusion 33 that can extend into the first open end 21 of the overflow tube 2, and the protrusion 33 is provided with an annular groove for receiving the first sealing pad 31, so as to facilitate the combination of the first sealing pad 31 and the sealing portion 3.

The pressure relief part 4 of the toilet overflow device is positioned above the sealing part 3, can be connected with the sealing part 3 in a sealing way and can be opened from the sealing part 3, so that the overflow pipe 2 is communicated with the outside air. The pressure relief portion 4 is substantially flat.

In the embodiment of the present invention, in order to realize the combination of the sealing part 3 and the pressure relief part 4, the sealing part 3 is provided with at least one pressure relief hole 32, the pressure relief part 4 is provided with at least one blocking column 41, and the blocking column 41 is in sealing fit with the pressure relief hole 32.

In a possible embodiment, a pressure relief hole 32 is formed in the middle of the sealing portion 3 and penetrates through the upper and lower sides of the sealing portion 3, and the pressure relief portion 4 has a blocking pillar 41, and the blocking pillar 41 can extend into the pressure relief hole 32 to combine the pressure relief portion 4 with the sealing portion 3.

Furthermore, in order to improve the tightness of the connection between the pressure relief portion 4 and the sealing portion 3 and prevent air leakage, a second gasket 42 is disposed on the end surface of the pressure relief portion 4 engaged with the sealing portion 3, and the second gasket 42 surrounds the outer periphery of the blocking post 41. In this embodiment, an annular groove is formed on the plugging column 41 and is used for accommodating the second sealing gasket 42, so as to facilitate the combination of the second sealing gasket 42 and the pressure relief portion 4.

In another possible embodiment, a plurality of pressure release holes 32 penetrating through the upper and lower sides of the sealing portion 3 may be formed in the sealing portion 3, and a plurality of blocking posts 41 are disposed on the pressure release portion 4, the blocking posts 41 are opposite to the pressure release holes 32 and have the same number as the pressure release holes 32, so that when the pressure release portion 4 is covered on the sealing portion 3, the blocking posts 41 can be inserted into the pressure release holes 32 to combine the pressure release portion 4 and the sealing portion 3.

Further, in order to improve the tightness of the connection between the pressure relief portion 4 and the sealing portion 3 and prevent air leakage, a second gasket 42 is disposed on the end surface of the pressure relief portion 4 that is engaged with the sealing portion 3, and the second gasket 42 may be disposed around the periphery of the plurality of plugging columns 41 to improve the sealing performance.

According to one present embodiment of the utility model, the cross-sectional area of at least one relief hole 32 is smaller than the cross-sectional area of first open end 21.

Specifically, when the sealing portion 3 has only one pressure relief hole 32, the sectional area of the pressure relief hole 32 is smaller than the sectional area of the first opening end 21; when the sealing portion 3 has a plurality of pressure relief holes 32, the sum of the sectional areas of the pressure relief holes 32 is smaller than the sectional area of the first opening end 21.

The sectional area of at least one pressure relief hole 32 is designed to be smaller than that of the first opening end 21, so that the pressure relief part 4 can be smoothly opened under the action of relatively small first liquid buoyancy, the effect of relieving pressure for negative pressure in the overflow pipe 2 is achieved, and after the overflow pipe 2 has no negative pressure, the sealing part 3 can be opened more easily, and the advantage of small size is achieved while labor is saved.

According to one embodiment of the present invention, as shown in fig. 4 and 5, at least one interlocking structure 5 is provided between the pressure relief portion 4 and the sealing portion 3, and the interlocking structure 5 is configured to make the pressure relief portion 4 drive the sealing portion 3 to separate from the first opening end 21 under the action of the second liquid buoyancy. The linkage structure 5 provides linkage guiding function for the pressure relief portion 4 to drive the sealing portion 3 to separate from the first opening end 21,

specifically, the interlocking structure 5 includes a guiding post 51 disposed on the sealing portion 3 and a guiding hole 52 disposed on the relief portion 4, the guiding post 51 is inserted into the guiding hole 52, a limiting member 53 is disposed at a top end of the guiding post 51, which penetrates through the guiding hole 52, and a diameter of the limiting member 53 is larger than an outer diameter of the guiding hole 52.

After the relief pressure portion 4 is opened on self sealing portion 3 under the effect of first liquid buoyancy, relief pressure portion 4 can be along guide post 51 rebound, after moving to this locating part 53 on relief pressure portion 4, because the blockking of locating part 53, and when increasing to second liquid buoyancy along with liquid buoyancy, relief pressure portion 4 can drive locating part 53 and shift up jointly, and then drive guide post 51 and the sealing 3 that links to each other with it and move up, break away from the first open end 21 of overflow pipe 2 until sealing 3.

According to one embodiment of the utility model, the toilet overflow device further comprises a float 6, and the float 6 is sleeved on the overflow pipe 2 and is connected with the pressure relief part 4.

Specifically, the float 6 is substantially in the shape of an annular cylinder, and is movably sleeved outside the overflow pipe 2, the float 6 has a sleeve body 61 and a floating body 62 connected to the sleeve body 61, the sleeve body 61 is sleeved outside the overflow pipe 2 and can be connected to the pressure relief portion 4, and the floating body 62 forms a hollow annular cavity 621, so that the float 6 can smoothly move up and down on the overflow pipe 2 under the action of liquid buoyancy. In this embodiment, the sleeve body 61 may be composed of a plurality of connecting plates, and these connecting plates are arranged at intervals along the circumferential direction and connected between the floating body 62 and the relief portion 4, so that the linkage effect of the float 6 driving the relief portion 4 is realized.

In order to enable the float 6 to move smoothly on the overflow pipe 2, a guide structure 8 is arranged between the float 6 and the overflow pipe 2, the guide structure 8 comprises at least one guide rib 23 and at least one guide groove 63, and the guide rib 23 can be inserted into the guide groove 63.

In a possible embodiment of the utility model, at least one guide rib 23 is provided on the outer circumferential wall of the overflow pipe 2 and at least one guide groove 63 is provided on the inner circumferential wall of the pontoon 6.

Specifically, at least one guide rib 23 is provided on the overflow pipe 2, at least one guide groove 63 is provided on the inner annular wall of the float 62, and the guide rib 23 can be inserted into the guide groove 63.

In this embodiment, two guide ribs 23 are provided on the outer wall of the overflow pipe 2 diametrically opposite each other, and two guide grooves 63 are provided on the inner annular wall of the float 62, in order to improve the stability of the movement of the pontoon 6 on the overflow pipe 2.

In another possible embodiment of the utility model, at least one guide rib 23 is provided on the inner circumferential wall of the pontoon 6 and at least one guide groove 63 is provided on the outer circumferential wall of the overflow pipe 2. Basically the same as the above embodiment, in this embodiment, only the arrangement positions of the guide groove 63 and the guide rib 23 are exchanged, and the detailed structure is not described again.

In the present invention, the inner diameter of the overflow pipe 2 is 28mm to 32mm in order to ensure a normal overflow capacity. In order to ensure that the sufficient air inflow and the size of the float 6 can meet the requirements of a toilet water tank and a safe water level, the diameter of the pressure relief hole 32 is 5 mm-10 mm. In addition, the opening height of the seal portion 3 is 18mm or more in order to secure a sufficient overflow area.

The working process of the toilet overflow device of the utility model is as follows:

as shown in fig. 1, in the initial state, the sealing part 3 is sealed with the first opening end 21 of the overflow pipe 2 through the first sealing gasket 31, the blocking column 41 of the pressure relief part 4 is inserted into the pressure relief hole 32, and the pressure relief part 4 is sealed with the sealing part 3 through the second sealing gasket 42; in the initial state, because negative pressure exists in the overflow pipe 2, the sealing part 3, the first sealing gasket 31, the pressure relief part 4 (mainly the plugging column 41) and the second sealing gasket 42 all receive the negative pressure, and the first opening end 21 and the pressure relief hole 32 of the overflow pipe 2 are sealed.

As shown in fig. 2 and 7, when the working water level in the toilet tank 1 rises, the buoyancy applied to the float 6 gradually increases, and when the buoyancy is greater than the negative pressure applied to the blocking column 41 and the second sealing gasket 42, the pressure relief hole 32 is opened, the outside air enters the overflow pipe 2, the pressure in the overflow pipe 2 is relieved, and at this time, the overflow pipe 2 is no longer under the negative pressure.

As shown in fig. 3 and 8, as the water level of the toilet tank 1 rises continuously, when the buoyancy force applied to the float 6 is greater than the gravity of the toilet overflow device, the float 6 moves upwards continuously, and then the pressure relief portion 4 moves upwards, and under the action of the linkage structure 5, the pressure relief portion 4 drives the cover to move upwards at the sealing portion 3 of the first opening end 21 of the overflow pipe 2, so as to open the first opening end 21 of the overflow pipe 2, and as the water level of the toilet tank 1 rises to the first opening end 21 of the overflow pipe 2, the overflow function is realized.

The toilet overflow device of the utility model applies the pilot principle, the sealing part 3 is provided with the pressure relief hole 32, and the buoyancy of the float 6 only needs to overcome the negative pressure of the pressure relief hole 32. The buoy 6 can be designed to be smaller, and is compact in structure and easy to realize.

Second embodiment

As shown in fig. 1 to 8, the present invention further provides a toilet tank 1 including a toilet overflow device 10 according to the first embodiment. The detailed structure, operation principle and beneficial effects of the toilet overflow device 10 have been described in detail in the first embodiment, and are not described herein again.

Specifically, the toilet tank 1 includes an inner cavity 11 for accommodating liquid, a drain valve 12 and an overflow pipe 2 are disposed in the inner cavity 11, and the toilet overflow device 10 is connected to a first opening end 21 of the overflow pipe 2.

Fig. 6 is a schematic view showing a configuration in which the liquid in the toilet tank 1 is at the operating water level, in which the sealing portion 3 of the toilet overflow device 10 is sealed to the first opening end 21 of the overflow pipe 2, and the pressure relief portion 4 is sealed to the sealing portion 3, and the overflow pipe 2 is not in a state of communication with the inner chamber 11 of the toilet tank 1. As shown in fig. 7, when the liquid in the toilet tank 1 rises to the overflow water level, the toilet overflow device 10 pushes the pressure relief portion 4 to rise under the action of the first liquid buoyancy received by the float 6, so that the blocking column 41 of the pressure relief portion 4 is separated from the pressure relief hole 32 of the sealing portion 3, and the outside air enters the overflow pipe 2 to realize the function of relieving the negative pressure in the overflow pipe 2; along with the continuous rising of the liquid in the toilet tank 1, the float 6 drives the pressure relief portion 4 to rise, and further drives the sealing portion 3 to rise, so as to smoothly open the first opening end 21 of the overflow pipe 2, as shown in fig. 8.

The toilet tank 1 of the present invention can effectively realize the overflow of the liquid in the tank, and can prevent the leakage of the liquid in the tank caused by the accumulation of the liquid in the tank due to the damage of the inlet valve.

Third embodiment

As shown in fig. 1 to 9, the present invention also provides a toilet including the toilet tank 1 according to the second embodiment. The detailed structure, operation principle, and beneficial effects of the toilet tank 1 have been described in detail in the second embodiment, and are not described again here.

The toilet bowl is provided with a toilet bowl body 7, and the toilet bowl body 7 is connected with an overflow pipe 2 in a toilet bowl water tank 1 through a water seal bent pipe 71 and a connecting pipe 72 which are connected, so that the purpose of discharging water from the overflow pipe 2 is realized.

The toilet of the utility model not only can effectively realize the overflow of the liquid in the toilet water tank 1 and prevent the problem of leakage caused by the accumulation of the liquid in the toilet water tank 1 which is possibly generated by the damage of the water inlet valve, but also can realize the effect of increasing the scouring force to the toilet body 7 by the drainage of the overflow pipe 2.

The above are only a few embodiments of the present invention, and those skilled in the art can make various changes or modifications to the embodiments of the present invention according to the disclosure of the application document without departing from the spirit and scope of the present invention.

Claims

1. A toilet overflow device, wherein the toilet overflow device is sealingly connected to an overflow tube located within a toilet tank, comprising:

a sealing part which can seal the first opening end of the overflow pipe;

2. The toilet overflow of claim 1, wherein the seal is provided with at least one relief hole, and the relief portion is provided with at least one blocking post that sealingly engages the relief hole.

3. The toilet overflow of claim 2, wherein at least one of said relief holes has a cross-sectional area less than a cross-sectional area of said first open end.

4. The toilet overflow device of claim 1, wherein at least one linkage structure is disposed between the pressure relief portion and the sealing portion, and the linkage structure is configured to cause the pressure relief portion to drive the sealing portion away from the first open end under the action of the second liquid buoyancy.

5. The toilet bowl overflow device of claim 4, wherein the linkage structure comprises a guide post disposed on the sealing portion and a guide hole disposed on the pressure relief portion, the guide post is inserted into the guide hole, wherein a limiting member is disposed at a top end of the guide post, which penetrates through the guide hole, and a diameter of the limiting member is larger than an outer diameter of the guide hole.

6. The toilet overflow device of claim 1, further comprising a float disposed over the overflow tube and coupled to the pressure relief portion.

7. The toilet overflow device of claim 6, wherein a guide structure is disposed between the float and the overflow tube, the guide structure comprising at least one guide rib and at least one guide slot, the guide rib being insertable into the guide slot.

8. The toilet overflow of claim 1, wherein the seal has an opening height of greater than or equal to 18 mm.

9. A toilet tank, characterized in that it comprises a toilet overflow device according to any of claims 1-8.

10. A toilet bowl comprising the toilet tank of claim 9.